Based on the analysis of the operating principle and circuit of the OCXO，a design method for intelligent compensation including frequency temperature stability compensation and aging compensation to frequency drifts of the OCXO is proposed in this paper. Some experiments are carried out to test the compensation results. The results show that the ultra high stability (frequency temperature stability of less than ±2.0×10-10(-40～+70 ℃, aging of less than ±2.0×10-11/d)) of a 10 MHz OXCO with the miniature size of 36 mm×27 mm×13 mmand wide temperature range can be realized by using the proposed intelligent compensation design scheme.